®
®
DAC-HF Series
ABSOLUTE MAXIMUM RATINGS, ALL MODELS
Positive Supply, Pin 24
Negative Supply, Pin 22
Digital Input Voltage, Pins 1–12
Lead Temperature (soldering, 10s)
+18V
–18V
+15V
300°C
TECHNICAL NOTES
1. Proper operation of the DAC-HF Series converters is
dependent on good board layout and connection practices.
Bypass supplies as shown in the connection diagrams.
Mount bypass capacitors close to the converter, directly to
the supply pins where possible.
2. Use of a ground plane is particularly important in high-
speed D/A converters as it reduces high-frequency noise
and aids in decoupling the digital inputs from the analog
output. Avoid ground loop problems by connecting all
grounds on the board to the ground plane. The remainder
of the ground plane should include as much of the circuit
board as possible.
3. When the converter is configured for voltage output with an
external operational amplifier, keep the leads from the
converter to the output amplifier as short as possible.
4. The high-speed current switching technique used in the
DAC-HF Series inherently reduces the amplitude and
duration of large transient spikes at the output (“glitches”).
The most severe glitches occur at half-scale, the major
carry transition from 011 … 1 to 100 … 0 or vice versa. At
this time, a skewing of the input codes can create a
transition state code of 111 … 1. The duration of the
“transition state code” is dependent on the degree of
skewing, but its effect is dependent on the speed of the
DAC (an ultra-fast DAC will respond to these brief
spurious inputs to a greater degree than a slow DAC).
Minimize the effects of input skewing by using a high-
speed input register to match input switching times. The
input register recommended for use with the DAC-HF is
easily implemented with two Texas Instruments
SN74S174 hex D-type flip-flops. This register will reduce
glitches to a very low level and ensure fast output settling
times.
5. Test the DAC-HF using a low-capacitance test probe (such
as a 10X probe). Take care to assure the shortest
possible connection between probe ground and circuit
ground. Long probe ground leads may pick up
environmental E.M.I. causing artifacts on the scope
display, i.e., signals that do not originate at the unit under
test.
50mA
17mA
FUNCTIONAL SPECIFICATIONS
DESCRIPTION
INPUTS
Resolution,
Bits
Coding,
Unipolar Output
Coding,
Bipolar Output
Input Logic Level,
Bit ON ("1")
Input Logic Level,
Bit OFF ("0")
PERFORMANCE
Nonlinearity Error,
max.
T
MIN
to T
MAX
Differential Nonlinearity Error,
max.
T
MIN
to T
MAX
Monotonicity
Gain Tempco,
max.
Offset Tempco,
Bipolar, max.
Zero Tempco,
max.
Settling Time,
ns max.
➂
Power Supply Sensitivity
OUTPUTS
Output
Output
Output
Output
Current Range,
Unipolar
Current Range,
Bipolar
Compliance Voltage
Voltage Ranges
➀
(Typical at +25°C and ±15V supplies unless otherwise noted.)
8B
10B
12B
8
10
12
Straight binary
Offset binary
+2.0V to +5.5V at +40μA
0V to +0.8V at –2.6mA
±0.012%
±0.024%
±0.012%
±0.024%
Guaranteed over oper. temp. range
±20ppm/°C
±10ppm/°C of FSR
➁
±1.5ppm/°C of FSR
➁
25
25
50
±0.01%/% Supply
0 to +5mA
±2.5mA
±1.2V
0 to –5V
0 to –10V
±2.5V
±5V
±10V
400 Ohms ±10%
15pF
15nA
±15V ±0.5V
40mA
45mA
17mA
17mA
Output Resistance
Output Capacitance
Output Leakage Current,
All Bits OFF
POWER REQUIREMENTS
Supply Voltages
Positive Quiescent Current,
max.
Negative Quiescent Current,
max.
PHYSICAL ENVIRONMENTAL
Operating Temperature Range,
Case
Storage Temperature Range
Package Type
Weight
Footnotes
0°C to +70°C (BMC)
–55°C to +125°C (BMM, 883)
–65°C to +150°C
24-pin ceramic DDIP
0.22 ounces (6.3 grams)
6. Passive components used with the DAC-HF may be as
indicated here: 0.1μF and 1μF bypass capacitors should
be ceramic type and tantalum type respectively; the 400Ω
output load is a ±0.1%, 10ppm/°C, metal-film type;
adjustment potentiometers are ceremet types; other
resistors may be ±10% carbon composition types.
7. Output voltage compliance is ±1.2V to preserve the
linearity of the converter. In the bipolar mode, the DAC-HF
can be operated with no load to give an output voltage of
±1.0V. In the unipolar mode, the load resistance must be
less than 600Ω to give less than +1.2V output. The
specified output currents of 0 to +5mA and ±2.5mA are
measured into a short circuit or an operational amplifier
summing junction.
➀
With external operational amplifier.
➁
FSR is Full Scale Range, or the difference between minimum
and maximum output values.
➂
Full-scale current change to ±1LSB with 400Ω load.
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
